Exchange 2010 Server Troubleshoot and Recovery

Exchange 2010 server failed due to storage failure. Exchange currently running with temp db. Failed due to a iscsi flap. The .edb file was corrupted beyond repair. Pst's were exported. Project needed in the next 8 hours. Need assistance with two functions 1. Mark the temporary edb as primary. 2. Import approximately 80 pst's into the mail database. We already tried an import utility and it didn't work and there wasn't any specific error message.l Validate users have old items Access via remote login. Logmein